=== Can I send messages to guests in their own language? ===
Yes, use the setting in Preferences 'Deduce language from country?' this will then enter the value in the Language field in the Mail tab of the booking. If there is no value the 'Default' language set in {{#fas:cog}} (SETTINGS ) > BOOKING PAGE > INTERNATIONALIZATION -> BOOKING PAGE LANGUAGE will be used.
=== I need to show the booking charges on the guest invoice not the payout amount, how can I do this? ===